Negative pressure type booster

Details Negative pressure type booster Negative pressure type booster

B - Operations, Transporting

60

T

B60T 13/57 (2006.01) B60T 7/12 (2006.01) B60T 8/32 (2006.01) B60T 13/575 (2006.01)

Patent

CA 2389209

A negative pressure type booster, comprising a valve seat member (40), a spring (47) energizing the valve seat member (40), and a holding member (52) having an engaging part (52b) disposed on a power piston (22) movably only in radial direction and engaged with the valve seat member (40) and a tapered part (52a) in contact with a plunger (37), whereby, when the amount of movement of an input member (27) relative to the power piston (22) is larger than a specified value, the input member (27) is brought into contact with the tapered part (52a) and moves the holding member (52) in radial direction to disengage the holding member (52) from the valve seat member (40) in order to allow the valve seat member (40) to be moved rearwards.

L'invention concerne un accélérateur à dépression comprenant un élément de siège de soupape (40), un ressort (47) servant à actionner cet élément de siège de soupape (40), ainsi qu'un élément de retenue (52) doté d'une partie de contact (53b) disposée sur un piston moteur (22) pouvant uniquement se déplacer dans un sens radial et entrant en prise avec ledit élément de siège de soupape (40) et une partie effilée (52a) en contact avec un piston plongeur (37). Lorsque le mouvement d'un élément d'entrée (27) par rapport au piston moteur (22) dépasse un seuil prédéterminé, l'élément d'entrée (27) vient au contact de la partie effilée (52a) et déplace l'élément de retenue (52) dans le sens radial de façon à libérer cet élément de retenue (52) de l'élément de siège de soupape (40) et à permettre à ce dernier de se déplacer vers l'arrière.

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